Tire-spreading device



- 35 carried b Patented Au 16, .1927.

UNITED STATES PATENT, OFFICE.

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TIRE-SPREADER!- DEVICE.

. Application fled November 10, 1928. Serial No. 147,4!38.

This invention relates to a tool which is especially adapted for spreadin the bead portions of a tire casing to enab e easy access to the inner surfaces thereof for repa1rs a or inspection.

The primary object is to provide a simple and convenient tool for this purpose which will spread the bead portions quickly, and which will then effectively hold the casing in spread posit-ion.

Further objects and advantages will be-, come apparent from the followlng description re ating to the accompanying drawing which illustrates the preferred form. The

1 essential novel characteristics appear in the claims.

In the drawing Fig.- 1 is a side elevation of the tool showing its operating position relative to'a tire casing an Fig. 2 is a plan view of thet-ool.

. As shown the jaws 1 arranged to be driven in opposite directions or toward each other by a screw 2. The screw has a right hand threaded 2 portion 2 on one end and a left hand threaded portion 2 on the other, each portion engaging a threaded hole in the respective jaw so that, assuming the jaws are held against rotation, turning the screw in a so given direction will spread the jaws apart and turning it in the opposite direction will bring them toward each other. Suitable means for turning the screw manually consists, as shown, of a hand crank 3 rigidly one end of the screw. For ho din the jaws against rotation and in parallel re ation to each other, I provide a uide bar 4 along which the jaws slide, eac jaw being apertured at its lower end to receive the bar, the bar and screw being maintained in fixed parallel relation b means of bearing blocks 5 and 6 rigid wit the bar and which serve as journals for the screw. When the tire casing has been spread considerably there will be some tendency for the beads to slip off the jaws, and 'to prevent this I show the bead en aging face of each jaw recessed as at 7.an provided with a series of teeth formed by notching the outwardly facing surface of each jaw' as at 8. Such teeth will frictionally oppose the tendency for the beads to slip even when the beads are quite widely sepatool consists of a pair of rated from their normal position. Also the teeth prevent any tendency of the whole device from rotating when once the teeth are firmly in contact with'the casing.

* liclaim:

1. A tire spreading tool comprising, in combination, a shaft having a right hand m threaded portion and a left hand threaded portion, a jaw associated with each threaded portion, saidjaws being adapted to engage the inside walls of a tire, and meansadjacent one end of the shaft for rotating it and for efieoting relative motion of said jaws along said shaft.

2. A tire spreading tool comprising in combination, a threaded shaft having right and left hand threaded Sort-ions, a aw associated wit-h each threa ed portion, and a crank for rotating the shaft.

3. In combination, a shaft having a right hand threaded portion and a left hand threaded portion, a jaw associated with each threaded portion, a guide bar extending parallel to the axis of the shaft and being slidably engaged by each of said jaws when the shaft is rotated, but allowing movement of the jaws in a direction axially of the shaft, 530 and means for rotating said shaft.

4. A tire spreading tool comprising in combination, spaced bearing blocks, a threaded shaft journaled in said blocks and extending therebetween, a guide member also ex-' ea tending between said blocks and parallel to the axis of the shaft, a jaw in threaded engagement with each threaded portion of said shaft, each jaw having a portion thereof slidably engaging said member, and a crank so operativel associated with; said shaft and mounted or turning movement outside one 7 of said blocks.

5. A tire spreading tool comprising in combination a threaded shaft having right and left hand threaded portions, a aw on each of said portions adapted to engage the tire bead, means for rotatingthe shaft, and means for maintaining the jaws in parallel relation to each other irres relative position along the s aft.

6. A tire spreadi tool comprising in combination a screw aving right and left, hand threaded portions a pair of jaws each adapted to engage an inner edge df a tire m6 casing, each jaw threadingly engaging a rective of their spective portion of the screw and a crank rotating it, and means to maintain the jaws rigidly secured to one end of the screw for in contact with the edge of a tire casing com- 19 rotating the same, prising teeth formed on the casing engaging 7. A tire spreading tool comprising in portion of each jaw.

5 combination a threaded shaft having right In testimony whereof, I hereunto aflix and left hand threaded portions, a jaw assomy signature, ciated with each threaded portion, means rigid with one extremity of the shaft for HUGH T. HUGHES. 

